Increasing Java's Memory Allotment - Mac
In order to load the 3D models properly, your computer may need to give Java access to more memory.
First, close all your browser windows.
Go to Applications/Utilities and open Java Preferences.
In the General tab, select J2SE 5.0 from the 'Java Applet Plugin' box and click the Options button.
Add -Xmx512m as a runtime parameter to the J2SE 5.0. If there are existing parameters, separate them with commas.
If you're running Snow Leopard, add the parameter for both 32-bit and 64-bit modes.